What is the difference between external and internal validity?

Asked By: Joost Oppo | Last Updated: 29th March, 2020
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Differences. The essential difference between internal and external validity is that internal validity refers to the structure of a study and its variables while external validity relates to how universal the results are. 4? There are further differences between the two as well.

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In respect to this, what is the difference between internal and external validity in psychology?

Internal validity is the extent to which the experiment is free from errors and any difference in measurement is due to independent variable and nothing else. External validity is the extent to which the research results can be inferred to world at large. It is a measure of accuracy of the experiment.

Furthermore, what is internal validity in research? Internal validity refers to how well an experiment is done, especially whether it avoids confounding (more than one possible independent variable [cause] acting at the same time). Therefore, internal validity refers to how well a piece of research allows you to choose among alternate explanations of something.

Beside this, what is the difference between internal validity and external validity quizlet?

internal validity: how strongly can we draw conclusions about the relationship between variables w/ in a study? external validity: do the results generalize to other individuals/ situations?

Why is external and internal validity important?

The concept of validity is also applied to research studies and their findings. Internal validity examines whether the study design, conduct, and analysis answer the research questions without bias. External validity examines whether the study findings can be generalized to other contexts.

28 Related Question Answers Found

What is internal validity example?

Internal validity is a way to measure if research is sound (i.e. was the research done right?). It is related to how many confounding variables you have in your experiment. For example, let's suppose you ran an experiment to see if mice lost weight when they exercised on a wheel.

What is an example of external validity?

Sarah worries that her results might not be applicable to people who are not in their late teens or early 20s, white, and rich. External validity is the extent to which results of a study can be generalized to the world at large. Sarah is worried that her study might have low external validity.

What are the two types of external validity?

There are two types of study validity: internal (more applicable with experimental research) and external. This section covers external validity. External validity involves the extent to which the results of a study can be generalized (applied) beyond the sample.

What factors affect internal validity?

Here are some factors which affect internal validity:
  • Subject variability.
  • Size of subject population.
  • Time given for the data collection or experimental treatment.
  • History.
  • Attrition.
  • Maturation.
  • Instrument/task sensitivity.

How do you test external validity?


The ultimate test of an experiment's external validity is replication — conducting the study over again, generally with different subject populations or in different settings. Researches will often use different methods, to see if they still get the same results.

What are the 4 types of validity?

There are four main types of validity:
  • Face validity is the extent to which a tool appears to measure what it is supposed to measure.
  • Construct validity is the extent to which a tool measures an underlying construct.
  • Content validity is the extent to which items are relevant to the content being measured.

How do you test validity?

Test validity can itself be tested/validated using tests of inter-rater reliability, intra-rater reliability, repeatability (test-retest reliability), and other traits, usually via multiple runs of the test whose results are compared.

How do you achieve internal validity?

Internal Validity
  1. Focus on accuracy and strong research methods.
  2. Controls extraneous variables.
  3. Conclusions are warranted.
  4. Eliminates alternative explanations.

What are threats to external validity?

In this section, four of the main threats to external validity that you may face in your research are discussed with associated examples. These include: (a) selection biases; (b) constructs, methods and confounding; (c) the 'real world' versus the 'experimental world'; and (d) history effects and maturation.

What is external validity quizlet?


External Validity. Refers to the degree to which within-study inferences generalize or can be generalized to a target population. Refers to the extent to which study results can be applied to other individual or settings.

What is meant by the internal validity of an experiment quizlet?

Internal validity means. the observed differences in the dependent variable are directly related to the independent variable and not due to some other unintended variable.

What is construct validity quizlet?

Construct validity is an assessment of how well you translated your ideas or theories into actual programs or measures. It essentially holds that the way to assure construct validity is to define the construct so precisely that you can operationalize it in a straightforward manner.

Why are correlational research designs often used in abnormal psychology?

Why are correlational (observational) research designs often used in abnormal psychology? It is often unethical or impossible to directly manipulate the variable involved in abnormal psychology. the casual pattern of disorder. Factors that are related to the development (or cause) of a particular disorder.

What are examples of threats to internal validity?

Eight threats to internal validity have been defined: history, maturation, testing, instrumentation, regression, selection, experimental mortality, and an interaction of threats.

Is construct validity internal or external?


These types are Internal, External, Statistically Conclusive and Construct. Internal Validity refers to the type where there is a causal relationship between the variables. External Validity refers to the type where there is a causal relationship between the cause and the effect.

How can you improve internal validity of a study?

You can increase the validity of an experiment by controlling more variables, improving measurement technique, increasing randomization to reduce sample bias, blinding the experiment, and adding control or placebo groups.

How do you test the internal validity of a questionnaire?

Questionnaire Validation in a Nutshell
  1. Generally speaking the first step in validating a survey is to establish face validity.
  2. The second step is to pilot test the survey on a subset of your intended population.
  3. After collecting pilot data, enter the responses into a spreadsheet and clean the data.